If you're a professional or business owner using Facebook as part of your marketing strategy, be sure to take advantage of the new Facebook vanity pages. You can sign up to get the username or company name you want. For example I am www.facebook.com/pachladis, which ties into my Twitter handle of @pachladis as well as my email, etc. If you're trying to create a personal brand or have an online brand for your offline business, consistency is important so try to keep your identities the same to get the benefits of the search engines indexing you or your company.
To sign up for your personal page, go to http://www.facebook.com/username. Dont wait long, because if someone gets the name you want before you do - it's too late. Also note that once you've chosen your vanity URL you can not change it, so choose wisely.